This makes sure we can run through the TurboFan pipeline without having
to parse the source when using the bytecode stream as input. This path
is now being tested by the BytecodeGraphTester helper.

R=titzer@chromium.org,rmcilroy@chromium.org

Review URL: https://codereview.chromium.org/1679313002

Cr-Commit-Position: refs/heads/master@{#33856}